I also think we may be talking about two entiirely different micro fibre cloths, now i'm a pretty keen photographer myself, and I certainly wouldn't shell out on a Kenro micro fibre cloth to clean my razors, I think what the majority of people cleaning their razors with are the blue coloured ones you buy from B&Q or Wilkinsons now these are specifically made for kitchen surfaces and stainless steel items like taps kettles and so on, the photography micro fibre cloths certainly would not harm your razor, as they are made for removing dust and grime from far more expensive items than a razor, I use the blue ones from B&Q on all of my straight razor restores and custom jobs, they work really well but I dont think they are as kind as many people make out.
Jamie.